STRUCTURAL DESIGN OF SAFETY-RELATED MICROPROCESSOR BASED PROCESS CONTROL SYSTEMS

Abstract

This paper first describes the latest progress in national and international standardization efforts concerning the use of microprocessor based safety-related systems. General design considerations applying to the German standards (TÜV Handbook, DIN 801) are then presented in the second part, where a commonly used failure model and certain process-related time constraints will be discussed. The third part of this paper deals with two possible examples of commonly used system structures and describes basic technical solutions to provide the necessary safety features.